The most common problem with drills are dirt, dust and grime. The most common effect is the the copper connections on the armature get coated and stop conducting properly.

To Clean it:
Take apart the drill (carefully)
remove the armature
Sand the copper so it shiny and smooth.
clean, remove any copper filings
Clean the rest of the drill the best you can
Note the gear box is suppose to have grease in it, so if its not giving you problems don’t clean it.

Landon

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